Commit 474832ec authored by Ross Zwisler's avatar Ross Zwisler Committed by Jiri Slaby

ext4: allow DAX writeback for hole punch

commit cca32b7e upstream.

Currently when doing a DAX hole punch with ext4 we fail to do a writeback.
This is because the logic around filemap_write_and_wait_range() in
ext4_punch_hole() only looks for dirty page cache pages in the radix tree,
not for dirty DAX exceptional entries.
Signed-off-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Signed-off-by: default avatarJiri Slaby <jslaby@suse.cz>
parent f0e1bad8
...@@ -3565,7 +3565,7 @@ int ext4_can_truncate(struct inode *inode) ...@@ -3565,7 +3565,7 @@ int ext4_can_truncate(struct inode *inode)
} }
/* /*
* ext4_punch_hole: punches a hole in a file by releaseing the blocks * ext4_punch_hole: punches a hole in a file by releasing the blocks
* associated with the given offset and length * associated with the given offset and length
* *
* @inode: File inode * @inode: File inode
...@@ -3599,7 +3599,7 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length) ...@@ -3599,7 +3599,7 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
* Write out all dirty pages to avoid race conditions * Write out all dirty pages to avoid race conditions
* Then release them. * Then release them.
*/ */
if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) { if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
ret = filemap_write_and_wait_range(mapping, offset, ret = filemap_write_and_wait_range(mapping, offset,
offset + length - 1); offset + length - 1);
if (ret) if (ret)
......
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